/*
 * WorldEdit, a Minecraft world manipulation toolkit
 * Copyright (C) sk89q <http://www.sk89q.com>
 * Copyright (C) WorldEdit team and contributors
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package com.sk89q.worldedit.extension.factory.parser.mask;

import com.google.common.base.Splitter;
import com.sk89q.worldedit.WorldEdit;
import com.sk89q.worldedit.extension.input.InputParseException;
import com.sk89q.worldedit.extension.input.ParserContext;
import com.sk89q.worldedit.function.mask.BlockStateMask;
import com.sk89q.worldedit.function.mask.Mask;
import com.sk89q.worldedit.internal.registry.InputParser;
import com.sk89q.worldedit.util.formatting.text.TextComponent;
import com.sk89q.worldedit.util.formatting.text.TranslatableComponent;

import java.util.stream.Stream;

public class BlockStateMaskParser extends InputParser<Mask> {

    public BlockStateMaskParser(WorldEdit worldEdit) {
        super(worldEdit);
    }

    @Override
    public Stream<String> getSuggestions(String input) {
        if (input.isEmpty()) {
            return Stream.of("^[", "^=[");
        }
        return Stream.of("^[", "^=[").filter(s -> s.startsWith(input)); // no block type, can't suggest states
    }

    @Override
    public Mask parseFromInput(String input, ParserContext context) throws InputParseException {
        if (!(input.startsWith("^[") || input.startsWith("^=[")) || !input.endsWith("]")) {
            return null;
        }

        boolean strict = input.charAt(1) == '=';
        String states = input.substring(2 + (strict ? 1 : 0), input.length() - 1);
        try {
            return new BlockStateMask(context.requireExtent(),
                    Splitter.on(',').omitEmptyStrings().trimResults().withKeyValueSeparator('=').split(states),
                    strict);
        } catch (Exception e) {
            throw new InputParseException(TranslatableComponent.of("worldedit.error.parser.bad-state-format", TextComponent.of(states)), e);
        }
    }
}
